good to see more ppl interested in the EU, even if it is only temporary. Well there is more to the EU than just comics, there are heaps of books out there and some decent games, but if ur trying to cram before ep3 then i suppose comics is the way to go.
If ur looking to read the comics that lead into ep3 or are somewhere in the vicinity of the prequel trilogy than i recommend reading the star wars republic series. The force.net has a timeline of all eu material, and if u go to the pre-ep3 era it lists a heap load of official comics.
check out the comics page, under the force.net while your there, it has a lot of info.
dark horse, is the current publisher so they also have their own timeline..
Dark Horse Timeline